The Standard Product Mfg.Co. Manufactures Insulated Storage Tank with 100mm Insulation Thickness. The Standard Product Mfg.Co. Offers Solar Heating Systems under the trade name `Atash`. The Insulated Storage Tank with 100mm Insulation Thickness consists of an absorber plate, which is coated on its sun facing surface with an absorbent coating, also called selective coating. The absorber consists of a grid of metallic tubes and sheet. Water flows through the tubes. The sheet absorbs the solar radiation falling on it and transfers the heat generated to the water. The absorber plate is placed in a front open box to protect it from weather. The space between back and sides of the absorber and the box is filled with insulation to reduce heat losses. The front of the box is covered with a high transmittance solar toughened glass. Flat plate collectors are specified on the basis of their area and are commonly of 1x2 m size.